lib/sec_id/isin.rb in sec_id-3.0.0 vs lib/sec_id/isin.rb in sec_id-4.0.0

@@ -6,11 +6,11 @@
     ID_REGEX = /\A
       (?<identifier>
         (?<country_code>[A-Z]{2})
         (?<nsin>[A-Z0-9]{9}))
       (?<check_digit>\d)?
-    \z/x.freeze
+    \z/x
 
     attr_reader :country_code, :nsin
 
     def initialize(isin)
       isin_parts = parse isin
@@ -19,10 +19,10 @@
       @nsin = isin_parts[:nsin]
       @check_digit = isin_parts[:check_digit]&.to_i
     end
 
     def calculate_check_digit
-      return mod_10(luhn_sum) if valid_format?
+      return mod10(luhn_sum) if valid_format?
 
       raise InvalidFormatError, "ISIN '#{full_number}' is invalid and check-digit cannot be calculated!"
     end
 
     private